Hand-stamp.



H. S. FOLGER.

HAND STAMP. v APPLICATION FILED SEPT. 13, 1912.

1 202 045 Patented Oct. 24,1916.

7 I 2 SHEETSSHEET I.

INC .vnwus PETERS co PNUYG-LHMOH WASHING mm, o. c.

H. S. FOLGER.

HAND STAMP.

APPLICAHON FILED SEPT. 13, 1912.

1,202,045. Patented 00. 24,1916.

2 SHEETS-SHEET 2.

. a w l l In HARRY S. FOLGER, OF- CHICAGO, ILLINOIS.

HAND-STAMP.

Application filed September 13, 1912.

To all whom it may concern:

Be'it known that I, HARRY S. FOLGER, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Hand-Stamps, of which'the following is a specification.

My invention relates to self inking hand stamps and has for its object improvements in Such devices.

In the particular form of hand stamp herein involved there is a changeable dating part, and the entire stamp including the fixed and changeable parts is reversed during the printing operation by being turned upon pivots by means of suitable cams. As heretofore made the pivot on which the stamp is reversed has usually consisted of a rod which'runs through the interior of the dating attachment with the result that the dating attachment could not be removed ex- 'cept by withdrawing the pivoting rod which with the result that the dating attachment may be quickly and easily removed and replaced without interfering with the arrangement of the stamp as a whole. One of the objections which have existed heretofore in stamps of this character is that in the repeated use of the stamp involving a turning of the stamp on its pivot, the pivoted bearing would wear and the general device would become loose and rickety.

A secondary object in the present invention is to provide the pivoting pins with means by which they may be adjusted so as to take up such wear. Still another object is to provide means for holding the pins so that they will not become loosened from adjusted position.

In the accompanying drawings Figure 1 is an elevation of the stamp in operating position; Fig. 2 is an end elevation with part of the bail broken away; Figs. 3 and 4 are sections on line 3-3 and 4-4, respectively, of Fig. 1'; Fig. 5 is an enlarged section on lines 55 of Figs. 1 and 3; Fig. 6 is a section on line 66 of Fig. 5; and Fig. is a detached view of the lock nut device for preventing the pivoting pins from becoming displaced.

The frame 10 is supported in a bail 11 on the upper end of which is a handle 12. Run

Specification of Letters Patent.

Patented Oct. 24, 1916.

Serial No. 720,110.

ning through the lower ends of the bail 11, frame 10, reversing cams 13 and slotted standards 20 are pins 14 which are secured to the base 16 and project outward from the opposite ends thereof. These pins are the pivoting pins upon which the stamp is reversed and being placed at the ends of the base they leave room between them for the removal and replacement of the dating attachment 17 without disturbing the adjustment of the pivots.

The cams 13 are pivoted at points 21 on the frame 10 and carry pins 22 which engage the slots in the standards 20, which standards are secured to the base 16. When the bail 11 moves upward on the frame 10 for reversing the stamp, the pins 14 move upward in the slots 19 of the frame 10 and the slots 23 of the pivoted cams 13. This upward movement of the pins 14 swings the cams on their pivots 21 and causes the pins 22 to move laterally first outward then inward-as the pins 14 pass from the position below to a position above the pins 22. In this movement the pins 14, acting on the cam surfaces 23 and the slot surfaces 19, are the direct means for moving the pins 22, and as the pins 22 swing the stamp on the pins 14, it is evident that 14 and 22 cooperate as turning pins for reversing the stamp.

The present invention, however, does not relate to the manner in which the stamp is reversed by the pins 14 and 22, but to means for taking up wear on the pivoting pins 14, and at the same time not make those pins in the form of a rod extending through the dating attachment 17, which extension would interfere with its removal and replacement. By observing Fig. 4 it will be seen that as the pin 14 rises it produces a lateral thrust on the cam 1323 to move the pin 22, which lateral thrust is resisted by contact with the side of the slot 19 in the frame 10. The continual movement of the pin 14 up and down in these slots acts to wear fiat places on opposite sides of the pins 14. As the pin 14 is fast to the base 16 which is' reversed, it makes a half turn in rising and falling, and this half-turn makes these fiat places are shaped. By observing Fig. 6 it will be seen that the flat place on one side of the pin 14 is not opposite the fiat place on the other side, but is displaced axiallycorresponding to the relative positions of the frame 10 and cam 13. As a consequence of these conditions the wear on the pin 14, as far as-the cooperating surfaces of and 13 are concerned, may be taken up by either a rotary or an axial movement of the pin 14, or by a combination of the two.

Because the pins 14 are securely held to the parts which are reversed, they turn on their bearings in the bail 11, but the wear here is on the entire circumference and not on one side. To maintain the bail in its proper relationship to the frame, the pins must have heads. The problem of taking up the wear on the sides of the pins preferably involves an easily adjustable rotary movement of them togetherwith means for holding the adjustment when made. But such an adjustment does not provide for wear in the bearings at the ends of the bail ll when parts that the normal operation of the device will wear the head sufficiently to permit a rotary movement of the pin to take up wear produced on the sides thereof by contact with the cam and slot 19, when that rotary movement is accompanied by an axial movement due to the screw heads in the nut 15. To take up the wear on the sides of the pin 14 by a rotary movement, which is the preferable way, the pin must be turned less than one complete rotation. Preferably it is turned about one-fourth or one-third of a rotation to present wearing surfaces to the cam and the slot 19. Such a rotary movement of the pin is accompanied by an axial movement, the extent of which is determined by the pitch of the screw. To make the parts operate satisfactorily, the angle of the cone should have the same ratio to the pitch of the thread that the wear on the sides'of the pin has to the wear on the cone. This last ratio is determined by experiments in ordinary use, and, assuming it to be fixed,

an increase in the pitch of the thread should be accompanied by a corresponding decrease in the angle between the sides of'the cone and its axis, while the decrease in the pitch of the thread should be accompanied by a corresponding increase in the angle of the cone; WVhen these parts are properly designed with respect to each other, and the normal rates of wear on the sides and cone, a simple turning of the screw 14 in its nut 15 will simultaneously and equally take up the wear at three places. Heretofore no provision has been made, as far as I am aware,

to take up wear in devices of this kind at any of these places. The nut 15 in its blank form is made as shown in Figs. 1, 5 and 6.

.In this condition the two vertical branches of the nut 15 are tapped out so thatthe screw 14 will fit into the threaded parts as shown in detail in Fig. 3. After the nut'is thing desired but is preferably a distance about equal to one-half of the pitch of the thread of the screw 14. In bending this free end 18 outward the bend is made so that the nut takes a set in this form and will naturally stay that form of itself. There is in the metal of this nut a certain degree of elasticity, which degree of elasticity is such that if the free end should be pushed backward to its original position by hand or in any other way, and then released, it would spring back into the position shown in Fig. 7.

Assuming now that the nut 15 is secured to the base 16 of the hand stamp as shown in Fig. 5, then if the screw 14 be inserted in place, it will enter the vertical leg of the nut 15 but will not enter the inclined leg 18 until the said leg is pushed inward to a vertical position. The reason for this is that the screw being threaded in both legs the distance between them must correspond to the pitch of the screw. The screw having been inserted in both legs of the nut 15 as shown in Fig. 6, the spring tension of 'the free leg 18 will act to bind upon the leg of the screw and prevent it from turning except by the application of considerable force. As a result of this, the nut 15 isin efiect a lock nut for holding the screw 14 in a desired position.

I claim: i

1. In a hand stamp, a die-plate, studs projecting from opposite ends of the die plate, lock nuts in which the studs are held and may be adjusted, cams engaging the sides of the studs and actuated thereby to turn the die-plate, and conical bearings for said studs, said conical bearings being so. related to the'pitch of the threads of the studs in the nuts that an adjustment for wear in the hearings will take up wear by the cams.

2. In a hand stamp, the combination with a frame, a bail, a die-plate, and cams for reversing the die-plate, of lock nuts secured to said die-plate, and counter-sunk head screws engaging said nuts and serving as turning pins for engaging said cams and as pivoting connections between said die-plate and said bail.

3. In a reversible self-inking hand stamp, a die-plate, lock nuts secured to said dieplate, cams for reversing said plate and. counter-sunk head screws engaging said nuts and serving as turning pins for engaging cams and as pivoting connections for said die-plate.

4. In a hand stamp, a die plate provided with devices for reversing it when the stamp 1s used, a pivotal support at each side of the die plate and upon which it turns, each pivotal support being subjected to wear at separated parts thereof when the stamp is operated, and means by Which an adjustment of one of said supports for Wear at one point necessarily involves adjustment for Wear at the other point, said means including devices for preventing the displacement of the adjustment made.

5. In a hand stamp, a die plate, cams for reversing the die plate, a pivotal support located at each side of the die plate upon which it turns, each of said supports being subject to Wear at particular places When moved, and means by Which the adjustment for Wear of either of said supports at one point involves the adjustment for Wear at another point.

6. In a hand stamp, the combination with a frame, a die-plate, and cams for reversing the die plate, of lock nuts secured to said die plate, and counter-sunk screws engaging said frame and adapted to operate as turning pins and as pivotal connections, each of said screws being subject to Wear at definite places, and means by which the adjustment of one of said screws for Wear at one point necessarily involves adjustment for Wear at another point.

7 In a hand stamp, a die-plate, lock nuts, studs adjustable in said nuts, cams engaging the studs and actuated thereby to turn the die plate, and conical bearings for said studs, said bearings being so related to the pitch of the threads on the studs that adjustment for Wear Will take up Wear on the cam.

Signed at Chicago, Illinois, this 10th day of September, 1912.

HARRY S. FOLGER.

WVitnesses:

WALTER H. REDFIELD, C. L. REDFIELD.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. C. 

